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V22CH8 Datasheet(PDF) 3 Page - Littelfuse

Part No. V22CH8
Description  Surface Mount Varistors - Transient Voltage Surge Suppressor
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
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V22CH8 Datasheet(HTML) 3 Page - Littelfuse

   
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Surface Mount Varistors
197
www .littelfuse .com
Transient Voltage Surge Suppressor
CH Varistor Series
Power Dissipation Ratings
Continuous power dissipation capability is not an applicable design
requirement for a suppressor, unless transients occur in rapid succession.
Under this condition, the average power dissipation required is simply the
energy (watt-seconds) per pulse times the number of pulses per second.
The power so developed must be within the specifications shown on the
Device Ratings and Specifications table for the specific device.
Furthermore, the operating values need to be derated at high tempera-
tures as shown in Figure 1. Because varistors can only dissipate a
relatively small amount of average power they are, therefore, not suitable
for repetitive applications that involve substantial amounts of average
power dissipation.
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140
150
AMBIENT TEMPERATURE ( oC)
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O1
T
T1
T2
TIME
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T1 = Virtual Front time = 1.25 • t
T2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T1 = Virtual Front Time
20µs = T2 = Virtual Time to Half Value
FIGURE 3. CLAMPING VOLTAGE FOR V22CH8 - V68CH8
500
400
300
200
100
90
80
70
60
50
40
30
20
10
PEAK AMPERES (A)
10-3
10-2
10-1
100
101
102
103
V56CH8
V47CH8
V39CH8
V33CH8
V27CH8
V22CH8
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
22 TO 56VN(DC) RATING
TA = -55
oC TO 125oC
V68CH8
FIGURE 4. CLAMPINGVOLTAGE FOR V120CH8 - V430CH8
4,000
3,000
2,000
1,000
900
800
700
600
500
400
300
200
100
10-3
10-2
10-1
100
101
102
103
104
V180CH8
V150CH8
V120CH8
V430CH8
V390CH8
V360CH8
V240CH8
V220CH8
V200CH8
PEAK AMPERES (A)
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
100 TO 430VN(DC) RATING
TA = -55
oC TO 125oC
Transient V-I Characteristics Curves
Pb
RoHS
3


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